Michael Lotz has published a screenshot of his Canon Digital Ixus 750 being accessed in Exposure with the PTP plugin. This shows that bulk transfer support is working. He also notes that a Logitech USB mouse was used to navigate Haiku to connect the camera.

Bulk transfers are essential for USB Mass Storage to operate, and while Haiku has had a USB mass storage driver donated, it still needs adapting to the new SCSI API. However, with HID devices working, and PTP working, USB on Haiku is one step closer to being at a level equal to or beyond R5.